BMW 51-21-7-479-343 Lock Cylinder

( Manufacturer Part Number: 51-21-7-479-343 ), ( Part Type: Lock Cylinder ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Year: 2018 2019 2020 2021 2022 2023 ), ( Parts Included: Only Part Reference 6 On The Diagram Is Included ), ( Replaces Part Number: 51-21-7-397-195 )

Review BMW Genuine Lock Cylinder fits 2018–2023

The **BMW 51-21-7-479-343 lock cylinder** is a precision-engineered, high-quality replacement part designed exclusively for BMW vehicles, specifically tailored to fit models equipped with the **5-series (E30, E34, E36, E39, and E60/E61)** and certain **3-series (E36)** and **7-series (E32/E38)** variants. This lock cylinder is a direct-fit, OEM-level component, meticulously crafted to ensure seamless integration with the vehicle s existing lock mechanism, delivering both reliability and security. Constructed from durable, corrosion-resistant materials, including hardened steel and high-grade polymers, this cylinder is engineered to withstand the rigors of daily use while maintaining smooth operation, even in harsh environmental conditions. Its advanced design incorporates a **multi-point locking system**, providing enhanced resistance against unauthorized access and tampering, a critical feature for vehicle owners seeking both security and longevity. The **51-21-7-479-343** is compatible with **side door locks, rear door locks, and trunk/liftgate mechanisms**, making it a versatile solution for comprehensive vehicle security upgrades. Whether replacing a worn-out original cylinder or upgrading to a more secure alternative, this part ensures a perfect match in terms of keyway compatibility, leveraging BMW s proprietary key coding system for effortless installation. Built to meet or exceed factory specifications, it eliminates common issues like sticking, misalignment, or premature wear, offering a long-term investment in your vehicle s protection and functionality. For professionals and DIY enthusiasts alike, this lock cylinder represents a straightforward, high-performance replacement that restores confidence in your BMW s security system.

### **Pros and Cons of Buying a BMW 51-21-7-479-343 Lock Cylinder**

1. **Original BMW Fitment** This lock cylinder is designed specifically for BMW vehicles, ensuring compatibility with the manufacturer s security and functionality standards.

2. **High-Quality Materials** BMW parts are generally made from durable materials, which can enhance longevity and resistance to wear compared to aftermarket alternatives.

3. **Better Security** BMW lock cylinders are engineered with advanced anti-picking and anti-drilling features, improving vehicle security against theft.

4. **Reliability** Since it s an OEM (Original Equipment Manufacturer) part, it is less likely to fail prematurely compared to cheaper third-party replacements.

5. **Resale Value** Using genuine BMW parts may help maintain the vehicle s value, especially if the lock cylinder is part of a full restoration or maintenance project.

6. **Warranty Coverage** If purchased directly from BMW or an authorized dealer, it may come with a warranty, providing peace of mind against defects.

7. **Professional Installation Compatibility** Locksmiths and BMW specialists are more likely to be familiar with OEM parts, ensuring proper installation and function.

1. **Higher Cost** Genuine BMW parts are significantly more expensive than aftermarket alternatives, which can be a financial burden for budget-conscious buyers.

2. **Limited Availability** Depending on the region, sourcing this part may require ordering from a BMW dealer or specialty supplier, which could involve longer wait times.

3. **Overkill for Basic Use** If the lock cylinder is only being replaced due to a minor issue (e.g., a lost key or minor wear), an OEM part may be unnecessary compared to a high-quality aftermarket option.

4. **Potential for Theft Risk** Some thieves target BMWs specifically, and even high-security OEM cylinders can be bypassed by skilled criminals using advanced tools.

5. **Complexity in Replacement** Replacing a lock cylinder may require specialized tools or expertise, especially if the vehicle has additional security systems (e.g., immobilizer integration).

6. **Environmental Concerns** Purchasing a new OEM part contributes to e-waste and resource consumption, whereas a refurbished or remanufactured part could be a more sustainable choice.

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### **Conclusion**

The **BMW 51-21-7-479-343 lock cylinder** is a high-quality, reliable option for BMW owners who prioritize authenticity, security, and long-term performance. It is ideal for:

- **Restoration projects** where original parts are desired.

- **Vehicles with high theft risk** where maximum security is critical.

- **Owners who value brand integrity** and are willing to invest in genuine components.

However, for **budget-conscious buyers** or those replacing a cylinder due to a minor issue, an **aftermarket alternative** (from reputable brands like ACDelco, VULCAN, or Locksmiths Direct) may offer a cost-effective solution without sacrificing quality. If purchasing the OEM part, ensure it is sourced from an **authorized BMW dealer or trusted supplier** to avoid counterfeit or substandard products.

- You are restoring a classic BMW or maintaining originality.

- You prioritize maximum security and reliability.

- You have the budget and can source it from a legitimate dealer.

- You need a cost-effective solution for a basic replacement.

- The cylinder is only being replaced due to a lost key or minor damage.

- You are working with a trusted locksmith who can recommend a high-quality aftermarket part (e.g., **Vulcan, ACDelco, or BMW-approved aftermarket brands**).

For best results, **consult a BMW specialist or locksmith** before purchasing to confirm compatibility and installation requirements.

Details:

Parts must be resalable and in the original packaging. Genuine BMW Parts. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Electrical parts are not returnable.

part #: 51217479343 prices

• $200.53-$223.17

specifications carlockiio:

• for makes: Bmw
• for years: 2018-2023
• mpn: 51-21-7-479-343
• part type: Lock Cylinder
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• year: 2018 2019 2020 2021 2022 2023
• parts included: Only Part Reference 6 On The Diagram Is Included
• replaces part number: 51-21-7-397-195

offer carlockiio:

• availability: In Stock
• started: April 2, 2026
• sold: 0
• options: Ship-to-home
• quantity: 2

shipping carlockiio:

• service: Standard, Expedited, Overnight
• cost: $20.20
• transit: 5-11 Days
• type: Fixed
• class: Standard, Expedited, One-day

returns carlockiio:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

general carlockiio:

• Car Truck Parts Accessories > Exterior Parts Accessories > Exterior Locks Lock Hardware
• condition: New

seller carlockiio:

• city: Reno, Nevada
• rating: 96.6%
• # reviews: 264

payments carlockiio:

• wallet: Paypal
• credit card: Discover
• other

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